Open AccessGravity waves mapped by the OMEGA/MEX instrument through O 2 dayglow at 1.27 μ m: Data analysis and atmospheric modeling
Author(s) -
Altieri Francesca,
Spiga Aymeric,
Zasova Ludmila,
Bellucci Giancarlo,
Bibring JeanPierre
Publication year - 2012
Publication title -
journal of geophysical research: planets
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.67
H-Index - 298
eISSN - 2156-2202
pISSN - 0148-0227
DOI - 10.1029/2012je004065
Subject(s) - gravity wave , airglow , physics , mesoscale meteorology , gravitational wave , martian , atmosphere (unit) , omega , mars exploration program , atmospheric wave , atmospheric sciences , latitude , astrophysics , geophysics , astronomy , meteorology , quantum mechanics
We present the occurrence of waves patterns on the southern polar region of Mars as traced by the O 2 dayglow emission at λ = 1.27 μ m during late winter/early spring of MY 28. The observations were carried out by the OMEGA (Observatoire pour la Minéralogie, l'Eau, les Glaces et l'Activité) imaging spectrometer on board Mars Express (MEX). Waves are found preferentially at high incidence angles and latitudes between 55° and 75°S. The dayglow intensity fluctuations are of the order of ±3% at incidence angle <88.5° and they can be explained by the propagation of gravity waves in the Martian atmosphere. Mesoscale meteorological modeling predicts gravity wave activity in the same range of latitude as the observed O 2 (a 1 Δ g ) wave patterns with temperature oscillations consistent with existing measurements. Moreover, gravity waves simulated through mesoscale modeling can induce dayglow fluctuations of the same order‐of‐magnitude as observed in the OMEGA maps. This study confirms that airglow imagery is a powerful method to detect and study the bi‐dimensional propagation of gravity waves, as foreseen in previous studies coupling photochemical and dynamical models.